Francis, Julie E. <br/><br/>
Ams radicarbon and cation-ratio dating of rock art in the bighorn basin of wyoming and montana. 

 - Washington-US :   Society for American Archaeology,   1993. 
 - p. 711-737 :   il. 
 - Trimestral 
 - Vol. 58, no, 4 (Oct 1993) 
 - American Antiquity ;   vol. 58 no. 4 .
 - Washington.   Society for American Archaeology. .
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